There's a chicken or egg problem with the "coven of witches" conjecture. I also don't think Gab is all that marginal. It seems to exist largely to facilitate conversations around perceived excesses with diversity efforts.

My greater point is that communities that facilitate these types of conversations typically have less inviting, more hostile cultures. There's a spectrum of course, but you can see glimmers of the type of discourse found on sites like Gab in the comment sections of anti-diversity blogs on HN. I think that an HN which plays host to more discussions about perceived issues with diversity will alienate a lot of folks who aren't entrenched in those sorts of debates and self-select for the type of discourse associated with these so-called "covens of witches." It seems to me that there's no value in sliding down that side of the spectrum for a site that's largely meant not to play host to ideological battles.